I assume you are testing the Chrome Extension? What operating system and what screen reader are you using. The accessibility of the extension still needs work but I was able to hear the buttons and invoke them using JAWS 15 in Windows 7 (64 bit) in English.

Hello all,
I spent some time with a screen reader user who helps me identify accessibility issues (as I do not personally use assistive technology). I am now improving the user interface with ARIA label etc.
Note that JAWS works best with Internet Explorer, not so great with Chrome. However, we are doing our best to make the Chrome extension as usable as possible, by everyone.
Thank you for your feedback!
Regards, Daniel